During the affair on Gryben, President Romana met an untrustworthy "knowledge broker" named Mephistopheles Arkadian. Now he has invited her to a meeting on board a World War II era Earth train, Europe, 1939. In exchange for helping him with a problem he's gotten himself into, he's willing to give the Time Lords information about the Free Time terrorists. Time is about to jump tracks. And Leela will discover what really happened to her lost husband.